package com.zhenyi.toupiao.core;

import java.security.Security;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

import org.bouncycastle.jce.provider.BouncyCastleProvider;

public class Encrypt {
	public static boolean initialized = false;

	public static final String ALGORITHM = "AES/ECB/PKCS7Padding";

	/**
	 * @param String
	 *            str 要被加密的字符串
	 * @param byte[]
	 *            key 加/解密要用的长度为32的字节数组（256位）密钥
	 * @return byte[] 加密后的字节数组
	 */
	public static byte[] Aes256Encode(String str, byte[] key) {
		initialize();
		byte[] result = null;
		try {
			Cipher cipher = Cipher.getInstance(ALGORITHM, "BC");
			SecretKeySpec keySpec = new SecretKeySpec(key, "AES"); // 生成加密解密需要的Key
			cipher.init(Cipher.ENCRYPT_MODE, keySpec);
			result = cipher.doFinal(str.getBytes("UTF-8"));
		} catch (Exception e) {
			e.printStackTrace();
		}
		return result;
	}

	/**
	 * @param byte[]
	 *            bytes 要被解密的字节数组
	 * @param byte[]
	 *            key 加/解密要用的长度为32的字节数组（256位）密钥
	 * @return String 解密后的字符串
	 */
	public static String Aes256Decode(byte[] bytes, byte[] key) {
		initialize();
		String result = null;
		try {
			Cipher cipher = Cipher.getInstance(ALGORITHM, "BC");
			SecretKeySpec keySpec = new SecretKeySpec(key, "AES"); // 生成加密解密需要的Key
			cipher.init(Cipher.DECRYPT_MODE, keySpec);
			byte[] decoded = cipher.doFinal(bytes);
			result = new String(decoded, "UTF-8");
		} catch (Exception e) {
			e.printStackTrace();
		}
		return result;
	}

	public static void initialize() {
		if (initialized)
			return;
		Security.addProvider(new BouncyCastleProvider());
		initialized = true;
	}
}
